Normal-



Oct. 27, G

CONSTANT FACTOR MECHANISM 6 Sheets-Sheet 1 Filed June 9, 1954 INVENTOR ERMAN GANG ATTORNEY Oct. 27, 1959 H. GANG CONSTANT FACTOR MECHANISM 6 Sheets-Sheet 2 Filed June 9, 1954 INVENTOR HERMAN GANG ATTORNEY Oct. 27, 1959 H. GANG 2,910,230

CONSTANT FACTOR MECHANISM Filed June 9, 1954 6 Sheets-Sheet 5 FIGQS INVENTOR HERMAN -GANG ATTORNEY Oct. 27, 1959 H. GANG CONSTANT FACTOR MECHANISM 6 Sheets-Sheet 4 Filed June 9, 1954 INVENTOR HER MAN GANG ATTORNEY Oct. 27, 1959 H. GANG CONSTANT FACTOR MECHANISM 6 Sheets-Sheet 5 INVENTOR HERMAN GANG Y ATTORNEY Filed June 9, 1954 H. GANG CONSTANT FACTOR MECHANISM Oct. 27, 1959 6 Sheets-Sheet 6 Filed June 9, 1954 lwowh mwao 0mm OVm ONM 0m 0w 0V ON 0 ATTORNEY United States Patent coNsrANT FACTOR MECHANISM Herman Gang, Livingston, N.J., assignor to Monroe Caiculating Machine Company, Orange, N.J., a corporation of Delaware Application June 9, 1954, Serial No. 435,435 9 Claims. (Cl. 235-79 The present invention relates to constant factor mechanism for calculating machines and, more particularly, to such mechanism for controlling the operation of differ entially operable value selection mechanism which is operable normally under control of the keyboard.

The constant factor storage devices of the invention are differentially settable under control of the keyboard and thereafter are adjustable to an ineffective position whereupon the keyboard is afforded its normal control of the differentially operable mechanism. Means are provided to adjust the constant factor devices from ineffective to a position effective to supersede the control of the keyboard to control the operation of the differential mechanism.

In the specific embodiment of the invention herein disclosed, the constant factor devices are operable to control the operation of digital value selection mechanism which is operable substantially in accordance with the principles disclosed in applicants copending application, Serial No. 219,620, now Patent No. 2,756,933; the selection mechanism being operable to adjust the differentially settable accumulator actuators of a calculating machine of the type fully disclosed in applicants US. Patent No. 2,531,207. In this type of machine, the accumulator actuating mechanism has an idle phase at the beginning of each cycle of operation. This idle phase is utilized in the operation of the differential selection means. The invention, however, will best be understood from the following description with reference to the accompanying drawings in which:

Fig. 1 is a right side elevation of a calculating machine embodying the invention with the side frame removed and parts in section.

i Fig. 2 is a detail front elevation of one of the digital actuator units for the accumulator register viewed as indicated by line 2--2 of Fig. 1.

Fig. 3 is a view similar to Fig. 2 of one of the digital actuator units for the constant factor indicating dials.

Fig. 4 is a detail side view of a pair of the differentially operable setting trains in an operated position.

Fig. 5 is a detail side View of the setting clutch'for the constant factor setting means and other operations associated therewith.

Fig. 6 is a detail side view of a portion of the operating mechanism for the keyboard clearing means.

Fig. 7 is a fragmentary perspective view of the keyboard lock slides and a portion of the clearing means.

2,910,230 Patented Oct. 27, 1959 Fig. 13 is a fragmentary side view of the means for adjusting the constant factor devices to controlling position.

Fig. 14 is a fragmentary side View of parts shown in Fig. 12 subsequent to the completion of the setting operation.

Fig. 15 is a fragmentary perspective view showing the constant factor enabling mechanism in normal position.

Fig. 16 is a chart illustrating the timing of the various mechanisms operated during a cycle of operation of the setting clutch.

Registering mechanism The wheels 1 (Fig. 1) of theaccumulator register are mounted in a shiftable carriage 2 and are driven by digital actuators 3 (Figs. 1, 2 and 4) and tens transfer actuators 4 through intermediate gears 5 and 6. Digital actuators 3 and tens transfer actuators 4 are mounted on shafts 7 and 8 respectively and are driven either forwardly or reversely at a one to one ratio by a gear train (not shown) which is exterior of the right side frame. The gear train is driven by a motor through sprockets 9 and 10, a reversible clutch transmission driven fromthe shaft on which sprocket 10 is fixed, and a friction clutch which transmits power to a shaft 11 on which one of. the gears of the train is mounted. Carriage 2 is denominationally shiftable to the right or left by the reversible clutch transmission through another friction clutch which is engaged upon disengagement of the friction clutch of the actuator drive. However, the clutch transmission and the drive means therefrom, for the actuating and carriage shifting mechanisms are not shown nor are the controls therefor, as they form no part of the present invention and reference is made to applicants aforenoted Patent No. 2,531,207 for a complete disclosure thereof.

Digital actuators 3 extend ordinally across the machine between the side frames. Each actuator 3 comprises a pair of stepped gears 3a and 3b (Figs. 1, 2 and 4) which are splined on shaft 7 and are urged outwardly from each other by a spring 12 into engagement with camplates 14a and 14b respectively. As will be hereinafter described another pair of actuator gears ltttla and 108 b (Fig. 3) are mounted forwardly of gears 3a and 312 between each pair of cam plates 14a and 14b. These actuator gears 100a and 10Gb adjust dials to indicate the values stored in the constant factor devices. When a pair of actuator gears 3a and 3b are in their zero or unset positions, they are operated ineifectively at opposite sides of the associated intermediate gear 5 as shown in Fig. 2. By means hereinafter described, digital actuator gears 3a and 3b (Fig. 2) are differentially adjustable inwardly from Zero or unset position toward one another by cam plates 14a and 14b respectively and thereupon are operable to effect digital actuation.

Fig. 8 is a fragmentary exploded perspective of the gear Each gear 311 comprises three stepped teeth and is afforded three steps of inward adjustment to bring one, two, or three of the teeth into driving relation with the associated intermediate gear 5. Thus, digital actuation of 1 to 3 is effected by actuator gear 3a. Each gear 3b comprises a series of six and a: series of four teeth in stepped relation and is affordedtwo steps of inward adjustment to bring the series of six or the series of four teeth into driving relation with gear 5 thereby providing for the registration of digital values 6 and 4 respectively. The digital registration of 5, 7, 8, or 9 is efiected bycombined operation of gears 3a and 3b wherein both gears are adjusted to effect the required tooth combinations. It will be obvious, however, that gears 3a and 3b could be constructed with other combinations of teeth and adjustments to effect the selected digital registrations.

From an inspection of Fig. 1 it 'will be seen that digital actuators 3 upon operation in either direction are afforded considerable angular movement before their teeth are engaged with the associated intermediate gears'S. There pin and slot connection with the slide.

is, therefore, an idle phase in each cycle of operation either forwardly or reversely. Upon operation of the machine in which the present invention is disclosed, the digital actuators are adjusted during this idle phase of movement.

The accumulator actuators are located in full cycle position when the machine is brought to rest by engagement of a pair of rollers of opposed spring urged locator arms with oppositely disposed low positions of a cam exteriorly ofthe right side frame as disclosed in the aforenoted Patent No. 2,531,207. Upon operation of full cycle stopping Value selection means including keyboard and differential setting mechanism A keyboard (Figs. 1 and 7) having a row of 1 to 9 digital value keys 22 for each digital actuator 3 comprises means for selecting the values to be entered into said actuators. Keys 22 of each row are held in retracted position by a spring 23 common to all of the keys of the row and engaging a recess of a shoulder at the right side of the lower end of each key stem.

Each row of keys 22 has a latching slide 28 which is adapted to latch any key in the row in depressed position, and upon depresion of any key in the row the slide is moved to release any previously latched key. Slides 28 are spring urged toward the front of the machine and have a series of depending lugs 28a each having a cam face normally engaging the under side of a shoulder 22:: at the left side of the end of the stem of a key 22. Upon depression of a key 22, its shoulder 22a engaging the cam face of a lug 28a will move the associated slide 28 toward the rear. As shoulder 22a passes below lug 28a, slide 28 will be allowed movement by its spring toward the front of the machine, thereby positioning the lug 28a above shoulder 22a to latch key 22 in depressed position. Each lug 28a has an inclined face at its forward under side.

I Therefore, if a key 22 is latched in depressed position and another key in the same row is depressed, the inclined face at the under side of lug 28a associated with the latched key will be moved to the rear of shoulder 22a of the key and spring 23 will then be effective to raise the key to retracted position. Upon further downward movement of the key which is being depressed, slide 28 will be restored forwardly to latch said key in the depressed position. Keys 22 perform no operation upon depression other than to a position their stems to control a subsequent setting operation.

A pair of complemental setting trains is associated with each row of keys 22 and with actuator gears 3a and 3b respectively of the associated digital actuator 3. Each pair of setting trains includes a pair of slides 29 (Figs. 1,

4, 12 and 14). Each pair of slides 29 is located in spaced rflitionshlp by combs 27 extending transversely of said 54 es.

Each slide 29 is urged upwardly by a spring 30 to engage the lower edge of a slot in and adjacent each end of the slide, with rods 25 respectively extending transversely of the machine. The slides will, therefore, yield downwardly from their normal positions.

Each slide 29 is held normally in rearward position (Figs. 1 and 14) by a bell crank 31, one arm of which has The other arm of each bell crank 31 has pin and slot connection with the forward arm of a lever 32. The free ends of the rearward arms of each pair of levers 32 of the complemental setting trains engage a cam surface 15a and 15b (Figs. 2

and 3) respectively of the cam plates 14a and 14b of i the associated pair of actuator gears 3a and 3b. Levgm 32 are intermediately pivoted on a shaft 33 which is supported on a pair of rockers 34 which are pivotally mounted at 35 on a pair of end plates 36 respectively and which are spring urged clockwise. Plates 36 are located adjacent the inner faces of the right and left side frames respectively of the machine and only one plate and rocker are shown in the drawings.

A drive train for the setting trains includes a pair of cam arms 37 (Figs. 1, 4, 12 and 14) keyed on a rock shaft 38 which extends across the machine. One of the cam arms 37 engages a roller on shaft 33 adjacent the rightmost pair of levers 32 and the other cam arm engages a roller on shaft 33'adjacent the leftmost pair of levers 32. When cam arms 37 are in normal counterclockwise position (Figs. 1 and 14), the arms engage pins 34a in rockers 34 respectively, thereby holding rockers 34 and shaft 33 in normal clockwise position. The rightmost cam arm 37 has integral therewith a depending arm which has link connection 39 with the depending arm of a cam follower in the form of a lever 40 located inwardly of the machine right side frame. Lever 40 is spring urged counterclockwise (Fig. 1) normally to engage a roller at its upper end with the low portion of a cam 26 fixed on actuator drive shaft 11.

Operation 0 the diflerential setting mechanism Upon initial operation of the registering mechanism, the low portion of cam 26 (Fig. 1) will be moved from engagement with the roller of cam follower 40 and the high portion engaged therewith. Cam follower 40 will therefore be rocked clockwise from the position shown in Fig. 1. This operation will be effected during the aforenoted idle phase of the registering mechanism. Clockwise movement of cam follower 40 will move connected link 39 forwardly thereby rocking cam arms 37 clockwise. Cam arms 37 engaging the rollers on shaft 33 will raise said shaft counterclockwise on its carriers 34 to the position shown in Fig. 4. Levers 32 mounted on shaft 33, in their upward movement, will tend to move the engaged cam plates 14a, and 14b inwardly toward one another from the position shown in Figs. 2 and 3 and to rock bell cranks 31 counterclockwise, thereby moving connected slides 29 toward the front of the machine. Unless the stem of a set digit key 22 is in the path of movement of a lug 29a of a slide 29 there will he no hindrance other than frictional to forward movement of the slide, and the associated setting lever 32 will be ineffectively operated as follows.

Upon upward movement of a lever 32, its rear free end engaging a cam surface 15a or 15b (Figs. 2 and 3) will tend to move a cam plate 14a or 14b inwardly against the tension of the associated spring 12. At the same time, the forward end of the lever 32 will tend to rock the connected bell crank 31 counterclockwise and move the slide 29 connected therewith forwardly. From the above, it will be seen that, due to spring 12, the resistance to upward movement of the rear end of lever 32 is much greater than is the resistance to such movement of its clockwise about shaft 33. Clockwise movement of lever 32 will rock the connected bell crank 31 counterclockwise and move slide 29 idly without interruption toward the front of the machine. Thus, no inward movement will be imparted to the associated cam plate 14a or 14b and the associated actuator gear 3a or 3b will remain in ineffective registering position as the machine is cycled.

The operation of the rightmost one of a pair of levers 32 engaging a cam face 15a of a plate 14a will now be described with a key 22 set in the associated key row. It will be noted from an inspection of Fig. 1 that depression of the number 3 digit key 22 will position its stem a very slight distance to the front of a lug 29a of the associated right slide 29. Slide 29 will therefore be blocked from any appreciable forward movement and the connected bell crank will be held in fixed position as shown in Fig. 4. Therefore, when shaft 33 is raised, the forward end of lever 32 will be restrained by bell crank 31 and said lever will be rocked counterclockwise, thereby raising its rearward end, which engages cam face 15a, the maximum distance. Thus, cam plate 1411 will be rocked counterclockwise (Figs. 2 and 3) to bring the three teeth of actuator gear 3a into position to engage the associated intermediate gear 5 as gear 3a is rotated beyond its idle phase of movement. During the above described operation, the left slide 29 of the pair will be moved without interruption toward the front of the machine and there will be no adjustment of the associated actuator gear 3b. It will be seen that, as shaft 33 is raised, predetermined degrees of forward movement are afforded slides 29 to engage their lug 29a with the stems of depressed keys 22 during which movement levers 32 are rocked clockwise.

' When slides 29 are blocked from further forward movement by the stems of keys 22, levers.32 will then be rocked predetermined distances counterclockwise depending upon the distances to which the respective slides 29 have been moved before being restrained by the stems of depressed keys 22. Actuator gears 3a, and 3b will therefore be adjusted'in accordance with the digital values of the set digital value keys22.

Subsequent to the setting of actuators 3 during the idle phase of the first cycle of operation, latching means are provided to maintain the parts in adjusted position for plural cycle operation. Furthermore, means are provided to release the latching means at the conclusion of the registering operation. The latching means and the control therefor, however, are not disclosed as they are not concerned with the present invention. In my copending application, Serial No. 219,620, now Patent No. 2,756,933, appropriate means are disclosed to control the operationand release of the actuator setting trains. Such means could be employed in conjunction with the setting trains of the present disclosure. Furthermore, although the aforedescribed actuator setting trains are described as embodied in the type of machine wherein the registering means has an idle phase of operation, it is obvious that said setting trains couldbe operated by an auxiliary or setting clutch prior to operation of the register actuating means or in a machine wherein the register actuating means has no idle phase of operation.

Keyboard clearing mechanism Means are provided to effect a keyboard clearing opera tion upon operation of a single cycle clutch (not shown). The engagement of this clutch for a keyboard clearing operation is effected upon depression of a clear key (not shown) substantially as disclosed in applicants Patent No. 2,531,206 to which reference is made for the details of this operation. In accordance-with the disclosure of this patent, depression of the clear key moves a slide 41 (Figs. 1, 6 and 15 of the present invention) toward the left of the machine to control engagement of the clear clutch for a single cycle of operation. The movement slide 41 also enables a power transmission train to effect the keyboard clearing operation upon operation of the clear clutch;

Slide 41 has a rearwardly extending slotted lug 41a (Fig. 6) which engages a flange of a collar 43 slidably but non-rotatably mounted to the outside of the right side frame of the machine on a shaft 44 which'is rocked counterclockwise from the position shown in Figs. 1, 6 and 15 and returned upon a single cycle of operation of the clear clutch. Collar 43 has an upstanding finger 43a adapted to engage the head of a stud 45 which is mounted at the rear end of a push rod 46 which is slidably mounted on the inner face of the right side frame of the machine. The head of the stud 45 extends outwardly through a slot in'the side frame which is shown by the dot-dash lines in Fig. 6. The head of the stud may therefore be engaged by finger 43a outwardly of the side frame. Normally upon counterclockwise movement of shaft 44 and collar 43, finger 43a will be moved idly to the outside of the headof stud 45. However, upon movement of slide41 toward the leftof the machine in response to the depression of the clear key, finger 43a will be moved into position to. engage the head of stud 45 when collar 43 is rocked counterclockwise. The above described adjusting operation is substantially in accordance with the disclosure of the aforenoted Patent No. 2,531,206. However, the structure of the keyboard including locking means for the keys and the clearing means of the present disclosure is of a different structure than the disclosure of said patent.

As hereinbefore described, keys 22 (Figs. 1 and 7) of each row are held in depressed position by lugs 28a of a latching slide 28 which is spring held toward the front of the machine, and upon rearward movement of the slide any depressed key of the row will be released by the holding lug 28a and will thereupon be retracted by a spring 23. The keyboard clearing devices include means for simultaneously moving all of the latching slides 28 toward the rear of the machine in a keyboard clearing operation.

Means for simultaneously moving all of slides 28 includes a bell crank 47 for each slide having one arm thereof engaging an upstanding lug of the associated slide as shown in Figsnl and 7. The other arm of each bell crank is engaged by the edge of a recess 48a in a slide 48 which extends transversely of the machine above slides 28. A bell crank 49 (Figs. 6 and 7) is mounted forwardly of and adjacent the left end of slide 43. A rearwardly extending arm of crank 49engages a slot 48b in the left end of slide 48 and the other arm of the crank has yieldable link connection 50 with a push rod 51 which is turned downwardly at its forward end. The downwardly turned endof rod 51 is engaged by the forward edge of a circumferential recess in a co1lar53 (Figs. 1 and 6) which is fixed on a rock shaft 54. Shaft 54 extends transversely across the machine and fixed thereon adjacent its right end is a depending arm 55 the end of which is engaged by the forward end of push rod 46.

Upon operation of the clear clutch in response to leftward movement of slide 41 (Figs. 1, 6 and 15), shaft 44 and collar 43 will be rocked counterclockwise from the position shown in Fig. 6. Collar 43 will have been adjusted inwardly by slide 41 and finger 43a will therefore engage the head of stud 45 thereby moving push rod 46 toward the front of the machine. Forward movement of push rod 46 will rock arm 55, shaft 54 and collar 53 clockwise from the position shown in Fig. 6. P ush rod 51 and yieldably connected link 50 will'therefore be moved toward the rear of the machine. The yieldable connection between rod 51 and link 50 is provided so that rod 51 may be moved a distance which Will insure movement of link 50 a sufficient dis tance toeffect the clearing operation as follows.

Upon rearward movement of link 50 connected bell crank 49 will be rocked counterclockwise from the'position shown in Fig. 7 thereby moving slide 48 toward the left of the machine. Leftward movement of slide 48 will simultaneously rock bell cranks 47 counterclockwise thereby moving latching slides 28 toward the rear of the machine and releasing any depressed keys 22 of the keyboard. As will hereinafter be described a keyboard clearing operation is adapted by the devices of the invention to adjust the constant factor devices to a position to control the setting of the digital actuators for the accumulator register of the machine in lieu of the normally controlling keyboard.

The constant factor devices It Will be recalled that each digital actuator 3 (Figs. 1, 2 and ,4) is adjusted by a pair of complemental differentially operable setting trains and that each setting train comprises a slide 29, a bell crank 31 and a lever 32. Furthermore, the movements of each pair of setrow; The constant factor devices of the invention control the operation of theysetting trains in lieu of the stems of keys 22.

The constant factor devicescomprise a pair of stepped segments 58a, and 5811 (Figs. .8, ll, 12, 14 and for controlling the operation of each pair of the differential setting trains. The stepped segments 58a, andiSSb' are rotatably adjustable on a shaft 59 extending transversely of the machine and rotatably mountedbeneath the differential setting trains. To provide forthe rotary adjustment of stepped segments 58a and 58b 'on shaft 59, each segment is provided with an internal annulus of recesses 60. Shaft 59 has a diametrical bore 61 in the vertical plane of each of the segments 58a and 58b and a pair of locating balls 62 is nested within each bore 61 and are each spring urged outwardly from one another to engage .a diametrically opposed pair of the recesses of a respective one of the stepped segments. Thus, it will be seen that, if upon rotation of shaft 59, a segment 58a or 58b is restrained from rotation therewith, the shaft may be rotated to move the associated pair of balls 62 to engagement with successive recesses 60 of said restrained segment. Therefore, the segments may be adjusted in various angular positions relative to one another on shaft 59.

Each stepped segment 58a (Figs. 8, 11, 12, 14, and 15) comprises a hub portion and three steps rising counterclockwise from said hub portion. Each stepped segnent 58b comprises a hub portion and two steps rising counterclockwise from said hub portion. The hub portions and the treads of the steps of segments 58a and 58b are adapted to control the excursions of the associated pair of differential setting trains in lieuof each control by the stems of depressedkeys 22 of the associated key row as follows:

It will be recalled that the operating end of the differential setting train associated with the actuator gear 3a of a digital actuator 3 (Figs. 2 and 4) is afforded one, two or three steps of movement under control of a depressed digital value key 1, 2 or 3 respectively to set said actuator gear for the registration of the digit 1, 2 or 3. and that during any one of these three setting operations the operating end of the setting train associated with actuator gear 3b is afforded no movement to adjust said gear from normal non-registering position.

Also, it will be recalled that the operating end of the difierential setting train associated with the actuator 3b of said actuator 3 is afforded one or two steps of movement under control of a depressed digital value key 6 or 4 respectively to set said actuator gear for the registration of the digit 6 or 4, and that during either one of these two setting operations, the operating end of the setting train associated with actuator gear 3a is afforded no movement to adjust said gear from normal nonregistering position. Furthermore, the actuator gears 3a and 3b are set for combined operation by combined movement of the associated pair of setting trains under control of the stems of digital value keys 5, 7, 8 or 9 to a forwardly extending feeler 31a thereof is in position to engage the hub portion or the thread of one of the steps of an associated constant factor segment 58a or 58b. If the feeler 31a of a crank 31 is rocked counterclockwise to engage the hub of a segment 58a as shown in Fig. 12, the associated slide 29 will be. afforded its maximum forward excursion as is the case when none of the digital value keys 1 to 3 of the associated key If the segment 58a is adjusted' row are depressed.

clockwise so that the feeler 31a engages the tread of its first step, the associated setting train will be controlled in'its movement so that the associated actuator gear 3a will be set forthe registration of the digit 1. If the segment. 58a is moved further clockwise so that feeler 31a engages the second step, actuator gear 3a will beset for the registration of the digit 2. If the segment 58a is moved still further clockwise, feeler 31a will engage the tread of the third step and the setting 10' train will be operated to set the associated gear 3a for the registration of the digit 3. In similar manner, a segment 58b may be positioned to control the operation of the associated setting train so that the associated actuator gear 3b 'will remain in zero non-registering posi tion, will be adjusted to register the digit 6, or will be adjusted to register the digit 4. Furthermore, it will be seen that a pair of segments 58a,'and"58b may be adjusted to control the movements of a complemental pair of setting trains to adjust a pair of actuator gears 3a and 3b of an actuator 3 for registration of the digits 5, 7, 8 or 9.

Setting of the constant factor devices setting trains forthe digital actuators 3 under control of depressed keys'22 of the keyboard as hereinbefore described. Then through a gear train hereinafter described, the clutch operates to set the constant factor devices comprising segments 58a and 58b under control of the operated differential linkage. Thus, selected :digits set on the keyboard are entered into the constant factor devices. Furthermore, during the single cycle operation of clutch certain ancillary operations hereinafter described are also effected.

Clutch 65 (Figs. 1 and 5) is of well known construction wherein counterclockwise movement of a detent 66 releases a spring urged pawl which couples the driven member of the clutch to a driving member which is driven by the motor by a gear 63. An operating linkage from key 64 to detent 66 is controlled by: a blocking member 67 rotatably adjustable in the same manner on shaft 59 as described in connection with'constant factor segments 58a and 58b. The control linkage for detent 66 comprises a lever 69 (Fig. 5) having an intermediate fixed pivot on which the lower end of the stem of key 64 has slot and pin mounting. One end of lever 69 has link connection with detent 66 and the opposite end of the lever has pivoted thereon a leftwardly extending arm 71 which intermediate its ends has slot and pin connection with the stem of key 64. On the left free end of arm 71 a depending finger 72 is pivotally mounted and spring urged counterclockwise to a normal position.

Detent 66 is normally spring held clockwise (Fig. 5) to clutch disengaging position. Link 70 will therefore be held toward the right and lever 69 counterclockwise. Upon depression of key 64 during the first part of its downward movement arm 71 will be swung counterclock- Wise about its pivotal mounting on lever 69 and no movement will be imparted to said lever and connected link 70. However, upon further downward movement of the key, finger 72 will engage an upstanding lug on blocking member 67 thereby restraining arm 71 from further counterclockwise movement. Further downward movement of key 64 therefore will rock arm 71 clockwise about its restrained left end. This clockwise movement of arm 71 will rock lever 69 clockwise and move link 70 toward the left and detent 66 counterclockwise to engage clutch 65. As will be hereinafter described, shaft 59 will be rotated clockwise upon operation of clutch 65 thereby moving blocking member 67 from engagement with finger 72. The left end of arm 71 will then be freed for downward movement and the spring of detent 66 will there- 9 fore be effective to rock said detent clockwise to engage the pawl of clutch 65 at the end of a single cycle of operation to disengage said clutch.

It will be recalled that the differential setting linkage for the digital actuator gears 3a and 312 is operable under control of the: keyboard by a cam 26 (Fig. 1) during the idle phase of a, registering cycle of operation. Furthermore, it will be recalled that the setting operation is effected by cam 26 through follower '40 and link 39. In accordance with the present invention, means are provided to operate cam follower 40 and link 39 by clutch 65 during the first portion of a cycle of operation independently of cam 26. This operation is effected by a snail like cam 74 (Fig. l) which is driven at a one to one ratio with clutch 65. When clutch 65 is in full cycle position (Fig. 1), a cam. follower 75 engages the low portion of cam 74. Cam follower 75 has link connection 76 with a depending arm of a bail 77 adjacent the left side of the machine. Bail 77 extends across the machine and at its end adjacent the right said frame said bail has a depending arm engaging a stud at the lower end of cam follower 40. The low portion of cam 74 rises counterclockwise (Fig. 1) through an angle of about 110 and extending counterclockwise from thereon the cam edge comprises a dwell which terminates in a step connecting the low portion.

Upon operation of clutch 65 and the attendant clockwise rotation of cam 74 follower 75 will be rocked coun terclockwise from the positionshown in Fig. 1 thereby moving link 76 toward the left end rocking bail 77 clockwise. Upon clockwise movement of bail 77 its depending arm engaging the stud at the lower end of follower 40 will rock said follower clockwise from the position shown in Fig. 1 thereby moving link 39 toward the front of the machine and setting the differential setting linkage in accordance with depressed keys 22 as previouslydescribed when follower 40 is rocked by cam 26. The above operation to set the differential linkage occurs as follower 75 is rocked by the rise of cam 74, after which cam follower 75 will engage the dwell of the cam. and therefore the linkage will be held in adjusted position until the end of the cycle. At the end of the cycle of operation of clutch 65, the dwell of cam 74 will be moved beyond cam follower and the cam follower and the operated parts will be spring restored to normal.

During the portion of the cycle of clutch 65 in which the differential linkage is held in adjusted position by cam 74, the constant factor segments 58:: and 58b will be adjusted on shaft 5 under control of said set differential linkage. This operation is effected by a segmental gear 78 (Figs. 8, 11, 12 and 14) which comprises one of a nest of gears including segmental gears 79 and 80 (Figs. 8, 9 and 10). Segmental gears 78, '79 and 8% are mounted for rotation as a unit on a shaft 81 and are driven by a 20 tooth spur gear 32 comprising a train extending from clutch 65 and fixed to gear 79 on shaft 81. The gear train extending from clutch 65 comprises a bevel gear 83 (Fig. 1) fixed for rotation with the driven member of said clutch. A bevel gear 84 driven at a one to one ratio with gear 83, a bevel gear 85 fixed for rotation with gear 84, a bevel gear 86 driven at a one to one ratio with gear 85, and a 20 tooth spur gear 87 fixed for rotation with bevel gear 86 and meshed with gear 82 which drives the nest of gears including segmental gear 78. From the gear ratios outlined above it will be seen that the nest of gears are driven at a one to one ratio with clutch 65.

Segmental gear '78 (Figs. 8, ll, 12 and 14) comprises 12 teeth of a normal 20-tooth spur gear and is adapted to the associated segment 58a.

will engage idler gear 88' to drive gears 89, 90 and shaft 59. It will benoted that each tooth of gear 78 will be indriving engagement with gear 88 during movement of said gear 88 through anangular distance of two tooth spaces. Therefore, although segmental gear 78 comprises twelve teeth,-gear 88 will be driven through the distance of thirteen tooth spaces. As a result, 20-toothed gear 90 will theoretically rotate shaft 59 through an arc of 234. Howevendue to lost motion in the gear train the angular movement imparted to shaft 59 will be somewhat less. As will appear in the following, 216 is the required rotation of shaft 59 from a position wherein segments 58a and 58b adjusted thereon are disabled or ineffective to control the differentially operable selection mechanism. The parts have therefore been designed to this end.

I Rotation of shaft 59 will be sufficient to move segments 58a and 58b clockwise to engage the riser of one of the steps or a shoulder at the rear of the last step of each segment respectively with feelers 31a of the associated bell cranks 31, regardless of the positions to which said segments have been-previously adjusted on said shaft. When ariseror a shoulder of a step of segment 58a or 58b engages a feeler 31a, the segment will be restrained from further rotation with shaft 59 and the yieldable spring and ball mounting of the segment will permit further rotation of shaft 591 so that the segments may be relatively adjustableto each other on said shaft.

From the above, it will be noted that it is not necessary to set segments 58a, 58b to a neutral or normalized Iposition before entry vof a new constant factor.

Fig. 12.;of the drawings illustrates the positions of a pair of the operated differential linkages when the associateddigital value 6 key 22is depressed, and illustrates ential linkage associated with gear 3a will be afforded its rnaximum'counterclockwise movement as shown in Fig.

12 andno movement will be imparted to the rear end of associated lever 32 to adjust gear 3a. From an inspection .of Fig. 12, it will .beseen that when crank 31, is in this extremecounterclockwise position, feeler 31a thereof will be moved downwardly so that it just engages the hub of Therefore, when segment 58a is rotated with shaft 59, the riser of the first step of the segment will be moved into engagement with feeler 31a to restrain said segment from further rotation with shaft 59 which rotation will be permitted by the yieldable mounting. .It will be observed that when segment 58a is in this position, it may control the extent of'counterclockwise movement of bell crank 31 and the movement of the connected parts of the setting train independently .of and in accordance with such control by the stem of digit key 6.

As hereinbefore noted the differential setting train associated with actuator gear 317 is adjustable to move said gear inwardly one step to adjust said gear for the registration of the digit 6 or two steps for the registration of the-digit 4. As illustrated in Fig. 12 the associated slide 29 of the setting train has been allowed one step offorward movement before being restrained from fur- .ther movement by the stem of set digit key '6. The rear end of lever v32 ofthe differential linkage will therefore be operated to adjust gear 3b one step ofmovement and the associated bell crank 31 will be allowed one step of counterclockwise movement.

.When crank 31 is adjusted this ,one step of movement as shown in Fig. 12, the tread of the first step of the associated -segment58b will be allowed to pass below -finger fila thereof with a very slight clearance upon rotapletes its cycle of-operation.

will'thereupon engage said fe'eler to restrain said -'seg'- mentfrom further rotation withsaid shaft. Therefore, a relative adjustment will be efiected between segments 58a and 58b on shaft 59 as shown in Fig. '12. Further- 3 more, it will be seen that when the segments 58a and "58b are in this position, the differential setting trains may be controlled in their excursions to the same' extent that they were controlled-by the stem of the depressed digit key 6. I

Upon study of the arrangement of the steps of segments 58a it will be seen that if the segments are'inposit-ion for engagementof feeler 31a of the associated bell crank 31 with the hub of said segment, the bell crank will-be afforded three steps of counterclockwise movement and the rear end of the associated lever 32 will be afforded no movement and therefore, the associated actuator gear 3a will remain in normal ineffective registering position.

If segment 58a is moved into position so that the tread of the first step will be engaged by the feeler of-bell crank 31, said crank will be afforded two steps of-move- .ment and actuator gear 3a will be adjusted one-step of the registration of the digit 1. Ifthe'tr'ead of the second step is moved into position for engagement, the actuator gear will be adjusted two steps for the registration of the digit 2, and if the segment is moved into position for the engagement for the tread of the third step, the actuator will be moved three steps for the registration of the digit 3. In similar manner the associated actuator gear 3b will be adjusted under control of the associated segment 58b for the registration of the digit 6 or the digit 4. At'the completion of the setting operation of the constant factor storage segments 58a and 58b, means are provided to move said segments to disabled position from which position they may be arbitrarily moved to controlling position as will be hereinafter described.

In Fig. 12 segmental gear 78 is shown just as it completes its movement to effect the setting operation of segments 58a and 58b and shortly before clutch 65' com- As clutch 65 completes its cycle of operation, gear 78 will be disengagedfrom idler gear 88 and brought to its normal position ofrest as shown in Fig. 14. Therefore, the gear train for setting the constant factor segments will be released and shaft59 on which segments are mounted will be released for counterclockwise rotation to thereby move segments 58a and 58b to disabled or ineffective position as follows.

A segmental gear 92(Figs. 13,14 and 15) is adjustably mounted on shaft 59 in the same manner as are mounted segments 58a and 58b. Meshing with gear 92 is an internal toothed arcuate rack arm 93 which is pivotally mounted at its rear and normally spring held in counterclockwise position against a fixed stop as shown in Figs. 14 and 15. As hereinbefore described, shaft 59 will be rotated through an angular distance of approximately 216. There are ten recesses comprising each internal annulus of segments 58a, 58b and'segmental gear 92. Therefore, the 216 through'which shaft 59 moves in setting operation will be equal to the angular extent of 6 of the recesses 60 with which balls 62 are;

engaged. Upon rotation of shaft 59 in the setting operation, gear 92-will be rotated therewith and move rack arm 93 clockwise until said arm engages the untoothed periphery of gear 92 thereby restraining both gear and arm from further movement as shown in Fig. 13. This restraint of gear92 and arm 93 will occur'when shaft 59 is half through its movement in the setting operation; Therefore, as shaft 59 completes its movement, said shaft will be stepped ahead the angular distance of three recesses 60 of gear 92.

From the above will be seen that as segmental gear 78 is moved from disengagement with gear 88 as shown in Fig. 14, arm 93 and shaft 59 with the parts mounted thereon may be restored counterclockwise until such movement is arrestedby engagement of said arm with its fixed stop. This movement will be sufiicient to move constant factor segments 58a, 58b from out of position to control counterclockwise movement of bell cranks 31 of the setting trains so that the keyboard will be-atforded its normal operation to control the setting of actuators 3. However, a latchslide (Figs. 1, 13, 14 and 15) will hold rack arm 93 in the clockwise position shown in Fig. 13 until the keyboard clearing means is operated as clutch 65 completes its cycle of operation. Latch 95 has a lug 95b which engages a notch 93b in the forward edge of rack arm 93 and holds the constant factor devices in controlling position when so moved by means hereinafter described. H The keyboard clearing operation is effected by a transmission train which isoperated by a roller'87a (Figs. 6 and 9) mounted on gear 37. Asclutch 65 completes its cycle of operation, roller 87a will engage the end'of a rightwardly extending arm of a spring held lever 96 thereby rocking said lever clockwise. A yieldable arm 96a is mounted at the end of the leftwardly extending arm of lever 96 and upon clockwise movement of said lever, arm 96a will engagea cam edge at the underside of' slide 48 as shown in Fig. 7 thereby moving said slide to the left to effecta clearing operation as hereinbefore described. Each of the keyboard latch slides 28 (Figs. 1 and 7) have a depending arm 28b forwardly of aibail 97 which extends transversely of the machine. Bail 97 has a depending finger 97a (Fig. 15 positioned a slight distance to the rear of the upstanding forward end 95a of latch slide 95. When slides 28 are moved rearwardly in a keyboard clearing operation, arms 28b will engage and rock bail 97 clockwise from the position shown in Figs. 1 and 15 thereby moving latch slide 95 forwardly to move lug 95b from engagement with notch 93b to release rack arm 93. Rack arm 93 will thereuponbe spring moved counterclockwise to normal. position thereby'rotating gear 92, shaft 59, and segments 58a, 58b mounted thereon to ineffective position. From the above it will be seen that as an incident to the movement of the constant factor devices to ineffective position, the keyboardwill be cleared so that a new value maybe entered thereupon for normal control of a registering operation or to control the entry of another value into said constant factor devices.

It will be recalled that upon depression of setup key 64 (Fig. 5) to control the engagement of clutch 65, the lug of blocking member 67 is engaged by a finger 72 thereby rendering the connecting linkage effective to move detent 66 to clutch engaging position; Blocking member 67 is yieldably mounted on shaft 59 in the same manner as are segments 58a, 58b and gear 92. At the same time that rack arm 93 is restrained from further clockwise movement as shown in Fig. 13, blocking member 67 will be brought into engagement with a limit stop 67a. Therefore, shaft 59 will be stepped ahead relative to blocking member 67 in the same manner and the same angular distance as described in connection with gear 92. When shaft 59 is rotated counterclockwiseto move segments 58a, 58b to disabled position, the lug of blocking member 67 will engage the side of finger 72 which will yield in clockwise direction. Thus blocking member 67 will be unrestrained from counterclock wise movement with shaft 59. When key 64 is released and the parts restored to normal position, finger 72 will be moved above the lug of member 67 into position to be moved into engagement therewith upon redepressiou of the key. It will be'seen, therefore, that the linkage which is operable to engage clutch 65 upon depression of key 64 will be enabled only when the-constant factor segments are in disabled position. Thus, only at this time may a setting operation be instituted to enter or substitute a new constant factor value for the value presently stored therein.

Constant factor indicating dials An ordinal series of dials 98 (Figs. 1, 8 and 10) are provided to indicate the digital value set in each pair of segments 58a, 58b respectively. "Dials 98 are each integral with a drive gear 98b and have yieldable ball and socket mounting on a shaft 99 extending transversely of the machine just below the upper edge of the keyboard cover. The digit values set in constant factor segments 58a, 58b areregistered inthe respective dials 98 by digital actuators each comprising a'jstepped gear 100a and 10% (Figs. 1, 3, 8 and 10). Each digital actuator 100a, 1001) is of similar construction to that of actuators 3a, 3b and are set simultaneously therewith by setting plates 14a and 14b. Digital actuators 100a, 10% are operated once during each cycle of operation of setting clutch 65 (Figs. 1 and 5) as hereinafter described. However, before effective operation of actuators 100a, a clearing operation for indicating dials 98 is effected by setting clutch 65. V

The clearing operation for dials 98 is effected through a gear train comprising segmental gear 79 (Figs. 8 and 9) previously mentioned as driven with segmental gears 78 and 80 at a one to one ratio with setting clutch 65. Segmental gear 79 comprises eight teeth of a complete 20-t0othed spur gear and is adapted to rotate shaft 99 on which dials 98 are mounted counterclockwise through idler gears 101, 102 and 103 which drive a gear 98a fast on said shaft. The clearing means for dials 98 is of Well known construction wherein a shaft on which the dials are adjustably mounted is rotated a sufficient distance to move all of the dials to zero registering position whereat they are blocked from further rotation as the shaft is rotated beyond. In the present case, the

stop for each dial 98 comprises the rear edge 105- of akeyboard guide plate which is in the path of movement of an elongated tooth of the .drive gear 98b for each of the dials 9.8 as shown in Fig. 10.

With reference to Fig. 9 it will be seen that when the parts are in normal position, segmental gear 79 is so dials 98 will be effective at the very start of 'the cycle positioned that the drive train for clearing indicating of operation of clutch 65. Furthermore, it will be seen so that dials 98 will be free for the registering operation by actuator gears 100a, 1001). When the parts are in normal position (Figs. 9 and 10) the drive trains for a clearing or a. registering operation respectively arev disengaged and therefore a yieldable detent 106 engages each idler gear 103 to hold dials 98 in adjusted position.

Each pair of actuator gears 100a, 10% (Figs. 3, 8 and 10) are axially adjustable on a square drive shaft 107 which is driven by a gear 108 having a Geneva section normally in locking engagement with an arcuate peripheral edge section of segmental gear 80 which, as heretofore noted, is driven at .a one to one ratio with setting clutch 65 (-Figs. 1 ,and 5). Upon operation of gear 80 by clutch 65, gear 108 remains'locked during the first part of a clearing operation for wheels 98. It will be noted that gears 100a, 100b have an idle phase of operation before they are rotated into position to effect registering drive to dials 98. Therefore, the clearing operation for dials 98 includes not only the portion of a cycle of clutch 65 wherein actuator gears 100a, 10% are locked but extends into a portion of the cycle during which said gears are moved in their idle phase of operation. With reference to Fig. 10 it will be ,seen that as the registering drive to gears 100a, 1005 is completed the Geneva lock section of gear 108 is again engaged by the arcuate edge of segmental gear 80 thereby holding the actuator gears 100a, 100binfull cycle position subsequent to movement thereof from driving engagement with the gear trains for Wheels 98.

the left from the position shown in Fig. 15.

Means are operable in conjunction with a keyboard clearing operation to adjust the constant factor segments 58a, 58b from disabled position to position effective to control the setting of digital actuators 3. Depression of a key 110 (Figs. 1 and 15), hereinafter termed a call up key, isoperable to institute a keyboard clearing operation and to adjust certain devices which are operable in response to the keyboard clearing operation to move the constant factor devices to enabled position. The lower end of the stem of freely retractable call up key 110 has pivotal connection at the rear of an arm 111 which is pivotally mounted at its forward end on a shaft 112 extending across the front of the machine. Arm 111 overlies the leftwardly extending arm of a bell crank 113 and the other arm of said crank has pivotal connection to the right end of a slide 114 which has slot and pin mounting at its left end. A lever 115, normally spring biased clockwise, is connected at its forward end with slide 114 and at its rear end has pivotal connection with an adjusting slide 116 which overlies keyboard clear control slide 41. A forwardly extending lug 116a of slide 116 is positioned for engagement with the right edge of an upstanding lug 41b of slide 41. At the rear of'slide 116 the open end of a slot of a lug 11612 engages a flange of a cam arm 117 which is longitudinally slidable but fixed for rotation with shaft 44 which, as previously described, is rocked counterclockwise and returned as an incident to a keyboard clearing operation. Normally when shaft v44 is rocked during a keyboard clearing operation, cam arm 117 will move idly to the right of a rightwardly extending pin 93a at the rear of rack arm 93.-

Upon depression of call up key 110 (Figs. 1 and 15), arm 111 will be rocked clockwise from the position shown in Fig. 15 thereby rocking bell crank 113 counterclockwise and moving slide 114 toward the right. Rightward movement of slide 114 will rock lever 115 counterclockwise thereby moving connected slide 116 toward Upon leftward movement of slide 116, lug 116a thereof will engage lug 41b of slide 41 thereby moving slide 41 also toward the left and instituting a keyboard clearing operation. Furthermore, upon movement of slide 116 toward the left lug 116b thereof will move cam arm 117 leftwardly on shaft 44 and into position to engagepin 93a when shaft 44 is rocked counterclockwise in the keyboard clearing operation. It will be noted that the above adjustments are effected before the keyboard clear clutch (not shown) is engaged for the clearing operation. Upon counterclockwise movement of shaft 44 to operate the keyboard clearing devices, as heretofore described, cam arm 117 will engage pin 93a thereby rocking rack arm 93 clockwise from the position shown in Figs. 14 and 15 to the position'sho'wn in Fig. 13. Segmental gear 92 will therefore be rotated clockwise by rack arm 93 to likewise move shaft 59 and constant factor segments 58a, 58b. It will be noted that the camming operation of'arm117 is so regulated that shaft 59 and the constant factor segments 58a, 58b will be moved clockwise the approximate distance from which they were moved counterclockwise to disabled position subsequent to the adjust- 7 calculation during which the digital values set in said 15 constant factor segmentscomprise one of the factors of said calculation. Such means comprises the aforedescribed latch 95, (Figs. 1 and 15). This latch, howevcrjis moved forwardly to releasing position by bail 97 during a keyboard clearing operation and will not be rendered effective until near the end of such operation. Therefore, if other means were not operable to intervene, rack arm 93 and constant factor segments 58a, 58b would be restored counterclockwise as shaft 44 is rocked clockwise to normal subsequent to the clearing operation; Such intervening means comprises an auxiliary latch 119 (Fig. 15) operable to hold arm 93 in clockwise adjusted position until latch 95 is enabled near the end of the keyboard clearing operation; Latch 119 is normally held counterclockwise by an upstanding lug on lever 115.

However, upon depression of call up key 110 and the attendant counterclockwise movement of lever L15, latch 119 will be spring moved clockwise so that its upper free end will be moved into position to engage the outer edge When of rack arm 93 when said arm is moved clockwise. arm 93 is moved clockwise in the call up operation, the upper active end of latch 119 will engage a notch 93!: in the outer edge of said arm thereby preventing said arm from counterclockwise movement when shaft 44 is re- I prevent-arm 93 from counterclockwise restoration and thus maintain the constant factor devices adjusted in controlling position;

After operation of the machine with the constant factor devices enabled to control the setting of digital actuators 3 for the accumulator register 1, means are provided to move said constant factor devices to ineffective or disabled position so that the keyboard may assume its normal control of the setting of said actuators 3. The disabling means is responsive to the entry of a digital value into the keyboard. As hereinbefore described, depression of a digital value key 22 will move the associated latch slide 28 (Figs. 1 and 7) toward the rear thereby rocking bail 97 (Fig. 15) clockwise. Clockwise movement of bail 97 will move latch slide 95 toward the front of the machine thereby releasing rack arm 93 and permitting said arm and the constant factor devices to be moved counterclockwise =to the position shown in Figs. 14 and 15. Furthermore, as disclosed in the aforenoted Patent No. 2,531,207 a keyboard clearing operation is effected as an incident to the termination of a program of multiplication or division. When the constant factor devices are used to control the setting of digital actuators 3 as a factor in a program of multiplication or division, it will be unnecessary to clear the keyboard at the end of such operations as there have been no digital values entered therein. Howover, such a keyboard clearing operation is automatically effected as an incident to the terminationof a program of multiplication or of division regardless of whether or not an entry has been made into said keyboard. As hereinbefore described, a keyboard clearing operation is effective to rock bail 97 and release latch slide 95, and therefore as an incident to the termination of such an automatic multiplication or division program wherein the constant factor devices are utilized, said constant factor devices will be moved to disabled position.

Timing of operations for constant factor indicating dials 98 (Figs. 1, 8 and 10) is instituted at'the very start of a cycle of operation of 1111 clutch and that. it is terminated after about 162 of operation of said. clutch in its, cycle. The chart shows tors, the effective operation does not begin until about 162.'of operation of clutch 65 at which time the clearing operation has been completed. The chart shows that cam 74 '(Fig'. 1) begins its operation to adjust the differential setting linkage for digital actuator gears 3 (Figs. 1 and 2) at the start of operation of clutch 65, that it completes the adjustment of thefdilferential setting linkage at about of operation, and that it maintains said linkage in adjusted position until near the end of operation of clutch 65. a The chart shows that the operation to set the constant factor segments 58a, 58b begins at approximately the time that the setting of the differential linkage iscompleted and that the setting of the constant factor devices is completed just prior to the release of the differential linkage by cam 74. As illustrated in the chart, the keyboard clearing operation is effected at the very end of the cycle of operation of clutch 65 and therefore, the stems of the set keys which controlthe adjustment of the differential setting linkage remain in effective position until the constant factor setting operation is completed. Although the relative timing of the aforeoutlined operations is not arbitrary, it will be understood that considerable latitude may be exercisedjin such timing. Therefore, the timing as charted in Fig. 16 is only illustrative of one operable relationship of the devices of the invention.

Although a preferred embodiment of the invention is hereindisclosed and the invention is obviously subject to modification and variation, the invention is to be restricted only as necessitated by the scope of the appended claims.

Iclaim:

1. In a calculating machine having value selection means including an ordinal series of diiferentiallyoperable setting trains each having a stop movable therewith and a keyboard for controllingoperation of said trains; storage devices for alternatively controlling operation of said trains, a carrier for said devices operable to move said devices toward the stops of said. setting trains respectively, yieldable mounting meansfor saiddevices on said carrier to. permit differential adjustment thereon, drive means for said carrier operable to move each device into engagement with the stop of an operated setting train respectively to thereby adjust said devices, and means operable to restore said carrier with said devices differentially adjusted thereon.

2. In a calculating machine having value selection means including differentially operable mechanism and a keyboard for controlling operation of said differential mechanism; storage devices for alternatively controlling operation of said differential mechanism comprising an ordinal series of stepped segments, a rotatable supporting shaft for said segments yieldable mounting means for said segments on said shaft to permit differential adjustment thereon, anddrive means for rotating said shaft to ad just said segments under control of said keyboard.

3. In a calculating machine having value selection means including an ordinal series of differentially operable setting trains each having a stop movable therewith,

- and a keyboard for controlling operation of said trains;

storage devices for alternatively controlling operation of said trains comprising an ordinal series of stepped segments, a rotatable supporting shaft for said segments,

yieldable mounting means for said segments on said shaft to permit differential adjustment thereon, and drive means for rotating said shaft to bring a step of each segment into engagement with the stop, of an operated setting train respectively to thereby adjust said segments.

4. In a calculating machine having value selection means including differentially operable mechanism and a keybOfiId for controlling operation of said differential mechanism; differentially settable storage devices for alternatively controlling operation of said differential mechanism, numeral wheels for indicating the setting of said storage devices, resetting means for said numeral wheels, actuating means for said wheels differentially adjustable under control of said keyboard, and drive means for setting said storage devices under control of said keyboard and for operating said resetting and actuating means seriatim.

5. In a motor driven calculating machine having value selection means including differentially operable mechanism, and a keyboard for controlling operation of said differential mechanism; differentially settable storage devices for alternatively controlling operation of said differential mechanism, a carrier for said storage devices comprising a rotatable shaft, spring means for rotating shaft to inetfectively position said devices, drive means operable by the motor to rotate said shaft against the tension of said spring means thereby moving said devices to controlling position, and latching means for holding said shaft against the tension of said spring means.

6. In a calculating machine having value selection means including differentially operable mechanism, a keyboard comprising settable digital value keys for controlling operation of said differential mechanism, and means operable to clear said keyboard; differentially settable storage devices for alternatively controlling operation of said differential mechanism, a carrier for said storage devices comprising a rotatable shaft, spring means for rotating said shaft to thereby inefiectively position said devices, drive means operable in response to operation of said clearing means for rotating said shaft against the tensionof said spring means thereby moving said devices to effective position, and latching means controlled by said clearing means for holding said shaft against the tension of said spring means.

7. In a calculating machine having selecting mechanism and a keyboard for controlling said selecting mechanism; differentially settable storage devices for alternatively controlling said selection mechanism comprising an ordinal series of stepped segments, a rotatable shaft, yieldable mounting means for said segments on said shaft to effect rotation therewith and to permit relative adjustment thereon, drive means for rotating said shaft in a given direction to adjust said segments under control of said keyboard, drive means for rotating said shaft in the opposite direction to move said adjusted segments to an 18 inetfective position and drive means for rotating said shaft in said given direction to enable said segments.

8. In a calculating machine having selecting mechanism and a keyboard for controlling said selection mechanism; differentially settable storage devices for alternatively controlling said selection mechanism comprising an ordinal "series of stepped segments, a rotatable shaft, yieldable mounting means for said segments on said shaft to effect rotation therewith and to permit relative adustment thereon, drive means for rotating said shaft in a given direction to adjust said segments under control of said keyboard, a spring operated device for rotating said shaft in the opposite direction to move said adjusted segments to an ineffective position, drive means for rotating said shaft in said given direction against the tension of said spring device to enable said segments, a latch for holding said segments in enabled position and means for releasing said latch.

p 9. In a calculating machine having value selection 1 means including differentially operable mechanism and a keyboard for controlling operation thereof; storage de vices differentially settable under control of said keyboard for alternatively controlling operation of said differential mechanism, numeral wheels for indicating the setting for said storage devices, actuating means for said wheels differentially adjustable under control of said keyboard, and drive means for operating said differential mechanism, for setting said storage devices and for'operating said actuating means.

References Cited in the file of this patent UNITED STATES PATENTS 1,120,746 Rinsche Dec. 15, 1914 1,344,191 Teetor June 22, 1920 1,371,526 Teetor Mar. 15, 1921 1,994,211 Crosman Mar. 12, 1935 2,305,780 Henzelmann Dec. 22, 1942 2,325,388 Friden July 27, 1943 2,374,333 Crosman Apr. 24, 1945 2,399,170 Chase Apr. 30, 1946 2,580,295 Grigsby et al. Dec. 25, 1951 2,678,162 Hutton May 11, 1954 2,714,989 Ellerbeck Aug. 9, 1955 2,722,376. Ellerbeck Nov. 1, 1955 FOREIGN PATENTS 218,923 Switzerland Sept. 16, 1947 

